Which among the following is not a base?

Which substance is present in the poison of a honeybee?

Write balanced chemical equations for the following:
$(a)$ Calcium carbonate reacts with hydrochloric acid.
$(b)$ Calcium oxychloride reacts with hydrochloric acid.
$(c)$ Sodium hydroxide reacts with zinc.

Write the chemical formula of bleaching powder. How is bleaching powder prepared? For what purpose is it used in drinking water?

Write balanced chemical equations for the following:
$(i)$ Carbon dioxide gas is passed through lime water.
$(ii)$ $NaOH$ solution is heated with zinc granules.

Which of the following cannot be used as an antacid for the treatment of acidity?